Help me for javax.naming.directory.InvalidAttributeValueException

Question

i change the password by jndi , and administrator of the Active directory
had changed password of every user ,but the user is not administrator login int,cannot change himself password.why not?please help me!
Hashtable env = new Hashtable();
String userName = "CN=test,OU=test,DC=huadi,DC=com";
String oldPassword = "test";
String newPassword = "456P@ssw0rd";
//Access the keystore, this is where the Root CA public key cert was installed
//Could also do this via command line java -Djavax.net.ssl.trustStore....
String keystore = "D:/Program Files/Java/jdk1.5.0/jre/lib/security/cacerts";
System.setProperty("javax.net.ssl.trustStore",keystore);
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.ldap.LdapCtxFactory");
//set security credentials, note using simple cleartext authentication
env.put(Context.SECURITY_AUTHENTICATION,"simple");
env.put(Context.SECURITY_PRINCIPAL,userName);
env.put(Context.SECURITY_CREDENTIALS,oldPassword);
//specify use of ssl
env.put(Context.SECURITY_PROTOCOL,"ssl");
//connect to my domain controller
String ldapURL = "ldaps://173.16.80.208:636";
env.put(Context.PROVIDER_URL,ldapURL);
try {
// Create the initial directory context
LdapContext ctx = new InitialLdapContext(env,null);
//change password is a single ldap modify operation
//that deletes the old password and adds the new password
System.out.println("----auth------");
ModificationItem[] mods = new ModificationItem[2];
//Firstly delete the "unicdodePwd" attribute, using the old password
//Then add the new password,Passwords must be both Unicode and a quoted string
String oldQuotedPassword = "\"" + oldPassword + "\"";
byte[] oldUnicodePassword = oldQuotedPassword.getBytes("UTF-16LE");
String newQuotedPassword = "\"" + newPassword + "\"";
byte[] newUnicodePassword = newQuotedPassword.getBytes("UTF-16LE");
mods[0] = new ModificationItem(DirContext.REMOVE_ATTRIBUTE,
new BasicAttribute("unicodePwd", oldUnicodePassword));
mods[1] = new ModificationItem(DirContext.ADD_ATTRIBUTE,
new BasicAttribute("unicodePwd", newUnicodePassword));
// Perform the update
ctx.modifyAttributes(userName, mods);
System.out.println("Changed Password for: " + userName);
ctx.close();
}catch (NamingException e) {
System.err.println("Problem changing password: " + e);
}catch (UnsupportedEncodingException e) {
System.err.println("Problem encoding password: " + e);
}

Answer 1

the exception is :
javax.naming.directory.InvalidAttributeValueException: [LDAP: error code 19 - 0000052D: AtrErr: DSID-03190F00, #1:
     0: 0000052D: DSID-03190F00, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 9005a (unicodePwd)
                      thanks!